195results about "Synchronisation" patented technology

The invention provides a joint denoising method and system based on multi-source noise suppression and sparse representation, and belongs to the technical field of noise suppression in ultrasonic detection of power equipment, and the method comprises the steps: synchronously collecting an ultrasonic echo signal, a vibration signal and an electromagnetic signal of a composite insulator; decomposing the ultrasonic echo signal into a plurality of modal components and undecomposed signal margins; extracting a dominant frequency component in the vibration signal, and identifying a resonance noise feature overlapped with the frequency band of the ultrasonic signal; detecting a pulse interference event in the electromagnetic signal, marking occurrence time and a frequency range, and generating a pulse event feature; performing frequency band suppression and time domain threshold processing on the modal component according to the resonance noise characteristics and the pulse event characteristics; performing sparse representation coding on the processed modal components, executing multiple rounds of iterative screening and orthogonalization processing, and screening an atom set matched with defect echoes; and reconstructing the de-noised ultrasonic signal by using the screened atom set, and combining the de-noised ultrasonic signal with the undecomposed signal margin to output a final result.

The invention discloses a defect detection method for transformer substation unmanned aerial vehicle inspection equipment, and belongs to the technical field of transformer substation defect detection. Performing temperature field inversion correction on the monitoring data, establishing an incidence matrix according to sub-pixel displacement quantification mechanical deformation, and matching a preset defect feature library to obtain a first detection result; according to the first detection result and an assembly digital twin model, correcting the incidence matrix and positioning an abnormal area; inputting the corrected incidence matrix into a defect detection model embedded with the component prior constraint, and outputting a second detection result; and constructing a causal graph of the inspection records and the assembly working conditions, and outputting a predictive maintenance strategy according to the second detection result and the abnormal region. According to the invention, the problems of low detection precision and insufficient association degree with the component state in the aspect of component defect detection in the prior art are solved.

The invention relates to the technical field of data acquisition, and discloses a distributed photovoltaic data acquisition method and device based on time synchronization. The method comprises the following steps: performing distributed transmission processing on nanosecond synchronous acquisition reference signals through a time delay compensation network to obtain trigger synchronization signals of a plurality of acquisition nodes, and performing data acquisition processing through a multi-channel parallel sampling circuit to obtain original voltage and current data; and carrying out data verification processing on the original voltage and current data through a digital filtering algorithm to obtain effective acquisition data, carrying out string matching analysis processing to obtain string feature distribution, and carrying out data screening processing through a state evaluation algorithm to obtain real-time performance data of the photovoltaic module. Through high-precision clock synchronization and parallel sampling technologies, nanosecond sampling synchronization of a plurality of acquisition nodes is realized, and the acquisition data is ensured to have a strict time sequence corresponding relation, so that an accurate data basis is provided for performance evaluation and fault diagnosis of the photovoltaic module.

The invention provides a dynamic high-precision PTP (Precision Time Protocol) time synchronization system realized based on an FPGA (Field Programmable Gate Array), which comprises a master device and a slave device, and the master device and the slave device are connected through a PHY (Physical Layer) to carry out PTP time synchronization; the master device and the slave device have the same structure and comprise an FPGA and a voltage-controlled crystal oscillator; in the master device, the FPGA obtains the frequency difference and the phase difference between the master device and an externally input reference source, further adjusts the frequency of a voltage-controlled crystal oscillator, corrects a local time mark, and sends a PTP message to the slave device; and in the slave equipment, the FPGA obtains the frequency difference and the phase difference between the slave equipment and the master equipment based on the received PTP message, so that the frequency of the voltage-controlled crystal oscillator is adjusted, and the local time scale is corrected. According to the invention, low-cost and high-precision PTP time synchronization is realized.

The invention relates to the technical field of satellite time service, and provides a satellite time service system and method for preventing cheating and suppressing interference, and the system is characterized in that double GNSS radio frequency modules are integrated in a GNSS radio frequency board, and each GNSS radio frequency module is responsible for receiving a BDS satellite signal; a double-BDS signal deception jamming recognition module is integrated in the satellite receiving board, and each BDS signal deception jamming recognition module is provided with a GNSS signal suppressing jamming detection method and a GNSS signal deception jamming detection method so as to perform jamming detection on one path of BDS satellite signals to obtain a satellite signal jamming state; the CPU is used for reading serial port message data for the two satellite signal deception jamming identification modules and analyzing UTC time; meanwhile, according to the satellite signal interference state, a radio frequency switch instruction is determined; and the FPGA is used for controlling the two GNSS radio frequency modules to output or reject BDS satellite signals according to the radio frequency switch instruction.

The invention discloses a cosmic ray muon-based time synchronization system and synchronization method, and relates to the field of digital information transmission. The system comprises a time detector and a track detector which are arranged corresponding to a standard clock, and a case matching module, a time difference calculation module, a time adjusting module, a time detector and a track detector which are arranged corresponding to a clock to be calibrated, the case matching module is used for matching the cosmic ray muons according to the track information of the cosmic ray muons detected by the two track detectors and determining whether the cosmic ray muons penetrating through the two time synchronization devices belong to the same muon case or not, and if the cosmic ray muons penetrating through the two time synchronization devices belong to the same muon case, the time difference calculation module is used for obtaining theoretical flight time according to the track information detected by the track detectors; actual flight time is obtained according to a time detector; the time deviation is calculated according to the actual flight time and the theoretical flight time, the time adjusting module calibrates the clock to be calibrated according to the time deviation, and the precision and reliability of time synchronization in complex environments such as underwater and underground environments are improved.

The invention provides a time synchronization method and device and a time synchronization system of an intelligent driving system, and relates to the technical field of data processing, in particular to the technical fields of automatic driving, electronic technology and time synchronization. The specific implementation scheme of the time synchronization method comprises the following steps: acquiring second-level world time and a corresponding second pulse signal; determining a second global timestamp corresponding to a predetermined edge of the pulse per second signal according to a first local timestamp of the captured pulse per second signal, a second local timestamp of the execution moment of the interrupt service function and the first global timestamp; wherein the interrupt service function is triggered by a second pulse signal; obtaining the second time of the current moment according to the global timestamp of the current moment and the second global timestamp; and obtaining the accurate time of the current moment according to the second-level world time and the within-second time. According to the invention, errors can be reduced, and high-precision global time can be provided.

The invention relates to a local clock calibration method and a time synchronization signal channel expansion system, a timed device receives a PPS signal transmitted by a channel expansion device, and the method comprises the following steps: based on a received PPS output signal, measuring and determining a period deviation y of a local clock of the timed device relative to a standard time; dynamically generating a correction step z and a correction interval b based on the period deviation y according to an allowable error threshold value Q; and in the next time service period, taking the calibration time interval b as a period, and utilizing the calibration step z to carry out multiple times of incremental adjustment on a local calibratable time counter, so that the timing of the local calibratable time counter is close to the standard time. According to the invention, the problem of one-to-many signal distribution can be solved with low cost and high reliability, and a time service algorithm which is low in calculation overhead and easy to transplant and deploy on MCUs with various performance levels can be realized.

Provided are a time synchronization method, apparatus and time synchronization system of an intelligent driving system, relating to the technical fields of autonomous driving, electronic technology, and time synchronization. The method includes: obtaining (S210) a second-level universal time and a corresponding Pulse Per Second signal; based on a first local timestamp of a captured Pulse Per Second signal, a second local timestamp of an execution time instant of an interrupt service routine, and a first global timestamp, determining (S220) a second global timestamp corresponding to a predetermined edge of the Pulse Per Second signal; based on a global timestamp of a current time instant and the second global timestamp, obtaining (S230) a sub-second time of the current time instant; based on the second-level universal time and the sub-second time, obtaining (S240) an accurate time of the current time instant.

The invention is suitable for the technical field of intelligent electric energy meters, and relates to an electric energy meter clock calibration system and method, and the system comprises an external clock module which is used for transmitting a second pulse signal to a microcontroller; the built-in clock module is used for providing real-time clock and calendar functions and automatic leap year adjustment, supporting an alarm clock and a periodic terminal, and realizing a built-in hard clock through an external crystal; the internal soft clock module is used for periodically triggering a timer terminal and synchronizing pulse per second of an external clock after accumulating a certain number of times; and the internal and external clock automatic switching module is used for switching to the internal clock module when the external clock module breaks down and synchronizing the internal soft clock module so as to ensure the accuracy of the clock. The electric energy meter clock is simple in structure and convenient to operate, and the accuracy and reliability of operation of the electric energy meter clock are effectively improved.

The invention relates to the resetting of a receiver timer of a receiver for correlating receiver time information with a time generated by a transmitter timer of a transmitter, wherein the receiver is designed to receive radio messages transmitted to it by the transmitter. During this resetting, a first message from the transmitter is received by the receiver, wherein the reception comprises a radio time period during which the receiver's radio is active. Information is determined from which the start time or end time of the radio time period can be determined. The receiver timer is then reset according to the determined information. The method is flexible and can be used in particular for so-called "sleepy devices" or receivers that are temporarily in a sleep state.

The embodiment of the invention provides a mobile mapping system and a time synchronization method, and is applied to the technical field of positioning and map construction. The system comprises a device to be synchronized, an industrial personal computer and a controller. The controller is used for determining a global time reference and determining a reference time point for acquiring a hardware trigger signal; the to-be-synchronized device is used for acquiring data according to the hardware trigger signal; and the industrial personal computer is used for associating the data acquisition time of the to-be-synchronized equipment with the global time reference according to the global time reference and a receiving time point for receiving the data sent by the to-be-synchronized equipment. The time service mode depends on a hardware trigger signal, and effective time service of data acquired by the multi-source sensor can still be realized in a scene with weak GNSS signals or without GNSS signals, so that the synchronization precision of data acquisition time of the multi-source sensor is improved.

A wireless parking meter with an improved antenna location is described. The antenna may be located within a covering protruding from the top of the parking meter, allowing radio frequency (RF) signals to be transmitted through a portion of the parking meter with high permittivity to the RF signals. Additionally or alternatively, the antenna may be located within the parking meter housing above a lower parking meter mechanism housing so that RF signals can be transmitted through the dome covering of the parking meter, which may have a high permittivity to the RF signals.

Provided are a time synchronization method, a time synchronization system of an intelligent driving system, an electronic device and a storage medium, relating to the technical fields of autonomous driving, electronic technology, and time synchronization. The method includes: obtaining a second-level universal time and a corresponding Pulse Per Second signal; based on a first local timestamp of a captured Pulse Per Second signal, a second local timestamp of an execution time instant of an interrupt service routine, and a first global timestamp, determining a second global timestamp corresponding to a predetermined edge of the Pulse Per Second signal; based on a global timestamp of a current time instant and the second global timestamp, obtaining a sub-second time of the current time instant; based on the second-level universal time and the sub-second time, obtaining an accurate time of the current time instant.

The invention discloses a high-precision self-timekeeping method based on an FPGA, and relates to the technical field of high-precision time synchronization, and the method comprises the steps: providing a 10MHz system clock through a constant-temperature active crystal oscillator, carrying out the up-sampling of the clock frequency to 200MHz through a phase-locked loop frequency multiplication algorithm, and carrying out the up-sampling of the clock frequency to 200MHz; performing time synchronization on the system by using reliable time data and effective pulse per second signals provided by a satellite module, screening and selecting reference pulse per second, recording reference pulse per second data of at least 30 minutes, monitoring a rising edge of the pulse per second based on a sampling rate of 200MHz, and storing a maximum value of a counter per second to an RAM (Random Access Memory); the high-precision self-timekeeping method based on the FPGA not only can cope with complex environmental conditions, but also can ensure that stable synchronization performance is kept under long-time operation, so that the strict requirement of a modern high-precision time synchronization system on clock precision is met.

Provided is a novel system for identifying the location of a terminal carried by a user or operated by the user.　This system includes at least one computer device. The system includes a location identification means for identifying the location of a terminal carried or operated by a user on the basis of the distance between each of a plurality of wireless devices and the terminal. The terminal may be a portable terminal carried by a first user. The system may include an evacuation-site identification means that identifies, on the basis of the identified location of the portable terminal, an evacuation site satisfying a prescribed condition.

The invention relates to a multi-time-source PTP time service circuit based on a Loongson SOC, and belongs to the technical field of timing systems. The time service circuit comprises a Loongson SOC, an FPGA, a high-stability crystal oscillator, an RS422 transceiver, a network card, a switch, computing blades 1-6 and an external clock source. According to the design scheme, the performance is stable and reliable, the mode is novel, the problem that interfaces between devices are incompatible in the equipment development process is solved, meanwhile, a design thought is provided for the time service scheme of the reinforced server, and a new solution is provided for transition of a new time service scheme and an old time service scheme. The scheme has been successfully applied to a certain reinforced server.

The invention discloses a time-frequency signal security bastion host which comprises an input module, an output module, a signal modulation and demodulation module, an identity authentication module, an equipment management module, a power management module, a signal security detection module, an equipment security audit module and a security login management module. Intranet and extranet isolation is carried out on extranet standard time-frequency signals and intranet time-using equipment through the time-frequency security bastion host, high-precision time-frequency security time service and output of intranet time synchronization signals are achieved, the accuracy of high-precision time frequency and the non-tampering property of standard time are guaranteed, and credible transmission of high-precision standard time is achieved.

The invention discloses an intelligent diagnosis method and system for a distribution network hot-line work robot. The intelligent diagnosis method comprises the following steps that clock synchronization is conducted on all parts of the distribution network hot-line work robot; collecting multi-source data of the distribution network hot-line work robot under the synchronous clock, wherein the multi-source data comprises operation data of each part of the distribution network hot-line work robot; performing data fusion on the multi-source data based on a dynamic adaptive weighted fusion algorithm of the multi-source heterogeneous data to obtain fused data; and constructing a three-level diagnosis model to carry out fault diagnosis on the fused data to obtain the fault type of the distribution network hot-line work robot component. According to the method, the multi-source data of the distribution network hot-line work robot are fused, and the multiple diagnosis models are constructed for fault diagnosis, so that accurate diagnosis and early warning of component faults of the distribution network hot-line work robot are realized, the missed diagnosis rate is reduced, and the maintenance cost is reduced.

Embodiments of a clock synchronization unit of an all-digital phase-locked loop (ADPLL), a successive approximation register (SAR) time-to-digital converter (TDC) of the ADPLL, and a clock synchronization method in the ADPLL are disclosed. In one embodiment, the clock synchronization unit of the ADPLL includes a dual flip-flop synchronizer, a phase frequency detector (PFD) connected to the dual flip-flop synchronizer, and a synchronization control circuit configured to control the dual flip-flop synchronizer and the PFD to perform clock synchronization between a reference clock input signal and a divided clock input signal, and to control the dual flip-flop synchronizer and the PFD to perform the clock synchronization between the reference clock input signal and the divided clock input signal with PFD operation instead. Other embodiments are also described.

The invention provides an illumination synchronization method, system and device based on a GPS and a cloud end, and a storage medium. The method comprises the following steps: establishing local synchronization time of each light master controller in each building; receiving a GPS signal and analyzing first UTC time information; communicating with a cloud time service server through a network to obtain second UTC time information; respectively performing signal quality evaluation on the first UTC time information and the second UTC time information; dynamically selecting or weighting and fusing the first UTC time information and the second UTC time information based on the evaluation result to generate a reference time; and taming and calibrating the local clock source by using the reference time, and outputting the updated local synchronization time. According to the invention, through double time service source guarantee, extremely low time service errors among the main controllers can be maintained, accurate synchronous playing and timing control of cross-building light show are realized, and the reliability, stability and picture consistency of a large-scale light show system are effectively improved.

The invention provides a real-time synchronization and noise suppression method and system for a photoetching sensor array, and the method comprises the steps: capturing scattered light intensity fluctuation during photoetching exposure to generate a time sequence calibration pulse, and calculating a time sequence offset by combining the pulse with an original data packet of a sensor through an FPGA timestamp synchronization engine; adjusting a trigger signal through a digital delay line to realize time sequence calibration; inputting the calibrated data into a self-adaptive wavelet threshold filter, generating a dynamic threshold based on the speed and vibration intensity of the workpiece table, and outputting purified data through wavelet decomposition, specific layer detail coefficient soft threshold processing and reconstruction; and finally, feeding back the noise residual error of the purified data to the FPGA, and triggering secondary calibration when the noise residual error exceeds a threshold value. Through deep cooperation of the hardware-level timestamp engine and the physical constraint filter, the problems of time sequence offset and noise interference of the sensor array are thoroughly solved.

The invention relates to an intelligent wearable device time synchronization processing method, device, equipment, medium and system, and belongs to the technical field of intelligent wearable devices. The intelligent wearable device time synchronization processing method comprises the following steps: acquiring accelerations of a plurality of intelligent wearable devices; after the acceleration of any two intelligent wearable devices exceeds a preset threshold value, recording first data collected by the multiple intelligent wearable devices; the first data comprises acceleration data, angular velocity data and air pressure data; and according to the first data, performing time synchronization processing on clocks of the plurality of intelligent wearable devices. According to the technical scheme, the time synchronization accuracy and reliability can be improved, and hardware does not need to be added.

This invention relates to the field of unmanned aerial vehicle (UAV) control technology, and in particular to an injector time calibration method, apparatus, device, and medium. The method is applied to the MCU of the injector and includes: detecting the presence of a PPS IN signal and obtaining a detection result; determining the timing status based on the detection result; obtaining an error coefficient, which is the first time difference amplified by the device every second; calculating the total error time to be compensated based on the error coefficient and the timing status; and executing a compensation mechanism based on the total error time, thereby improving the synchronization accuracy and timekeeping accuracy.

The invention discloses a full-wave-band dynamic sunlight player with a three-stage coaxial soft light structure, and relates to the technical field of healthy lighting and high-precision simulation light sources. The core three-stage coaxial soft light structure is composed of a high-atomization concave soft light cavity, a convex high-reflection soft light structure and a full-coating high-transmittance soft light shell which are coaxial, and glare-free and high-uniformity full-wave-band light emitting is achieved. The equipment is provided with a full-wave band narrow-band combined lamp group covering weak ultraviolet rays to near infrared rays, so that a continuous sunlight spectrum is formed; single-band single-line independent driving is adopted, a pure hardware simulation gradual change control unit is matched, and non-stroboscopic smooth gradual change and accurate regulation and control are achieved. The equipment is provided with a local time service module and a storage medium, and a networking module can be selected to be matched with a factory spectrum calibration method to guarantee output consistency. The system can truly restore the natural sunlight spectrum, adapts to the biological rhythm, is suitable for medical treatment, laboratories, space stations and other scenes, and has the advantages of being high in reliability, continuous in spectrum, strong in soft light effect, high in biological friendliness and the like.

In various examples, sets of correlated timestamps are sampled from clock sources. The sets of correlated timestamps are used to compute translation data, such as offsets and / or rates of change of the clock sources. The offsets and / or rates of change may be used to translate a timestamp to a reference time domain. The sampled clock sources may be frequency locked and the translation may be performed without using the rates of change. For example, a running average of the offsets may be used to perform the translation. The translated timestamps and corresponding sensor measurements may be provided to one or more applications for use in performing one or more operations for a machine, such as perception and / or control operations.

The invention provides an automatic monitoring and timing method and system for an electric energy meter clock, and relates to the technical field of intelligent electric energy meters, and the method comprises the steps: obtaining a plurality of standard time source signals, and carrying out the real-time verification, and obtaining a plurality of standard time sources; performing clock monitoring on a master station clock to obtain a master station clock state, and generating a first timing list; the terminal clock is patrolled through the master station, and a second timing list is generated; the clock of the electric energy meter is patrolled through the master station and the terminal equipment, and a third timing list is generated; and acquiring equipment environment data, and generating a time calibration strategy in combination with the first time calibration list, the second time calibration list and the third time calibration list. According to the method and the device, the technical problems of drifting and error accumulation of the clock of the electric energy meter caused by external factor influence, battery performance reduction and the like in the prior art are solved, the timing strategy is determined by acquiring and verifying multiple standard time source signals and combining the equipment environment data, and the timing accuracy and efficiency are improved.

Optical frequency reference apparatus (10) comprising - an atomic vapor cell (1), containing a vapor of reference atoms, said atomic vapor cell (1) comprising a first end (41) having a first window (4) and a second end (61), - a laser source (11) for generating a laser probe beam (3) adapted to excite a two-photon optical transition of said reference atoms, - an optical detector (14), adapted to detect a fluorescence signal emitted by said reference atoms, and - at least one reflective element (5, 15) wherein the laser source (11), the atomic vapor cell (1) and the at least one reflective element (5, 15) are configured such that, in operation, the probe beam (3) enters the atomic vapor cell (1) through said first window (4) at said first end (41) and crosses said vapor of reference atoms until said second end (61) through a defined optical path in a first forward direction (3a), the probe beam (3) is reflected backwards by said at least one reflective element (5, 15) and crosses said vapor of reference atoms a second time through the same defined optical path, in a second direction (3b) opposite to the first forward direction (3a), characterized in that the optical frequency reference apparatus (10) further comprises means (7, 9) for absorbing the reflected laser probe beam (3) exiting from the atomic vapor cell (1) according to the second direction (3b).

The invention discloses a method and device for a system to automatically calibrate a court electric energy meter clock, a system terminal and a metering box, and relates to the technical field of clock calibration, and the method comprises the steps: querying a time synchronization information group recorded by an electric energy meter of a court; calculating a clock error of the electric energy meter at each temperature point according to the time synchronization information group; and carrying out clock calibration on the electric energy meter based on the clock error. Through system time acquisition and logic of calculating a target clock error according to the temperature, real clock skew at different temperatures can be accurately matched, the problems of excessive calibration at a low temperature and insufficient calibration at a high temperature are avoided, the accuracy of an electric energy meter clock can be effectively improved, and error accumulation caused by temperature change is reduced. And through systematic data processing and analysis, the calibration process is further optimized, and the overall efficiency is improved.

The present disclosure provides a method, apparatus, transportation vehicle, and storage medium for restoring a system clock. The specific solution includes: when a microcontroller unit (MCU) switches from a sleep state to a wake state, reading the time of a real-time clock (RTC); in response to successful reading of the RTC time, restoring the system clock of the MCU based on the read RTC time; or, in response to failure to read the RTC time, obtaining a status switching compensation time and a system time of the MCU, and restoring the system clock of the MCU according to the status switching compensation time and the system time, so that the system clock of the MCU can be restored quickly and accurately, improving the time restoration efficiency of the system clock of the MCU and improving the efficiency of the timing system.